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The Old World hookworm is an intestinal parasite. The image above was taken by a scanning electron micrograph and was color-enhanced. The worm's actual size ranges from 0.03 inches to 0.3 inches.

Could Worms In Your Gut Cure Your Allergies?

Some people are trying to treat autoimmune problems with an unlikely tool: worms that live in your gut, permanently. Scientists are finally starting to figure out whether they work.

These satellite images of the West Coast show sea surface temperature anomalies from July 2015 (left) and January 2016 (right).

'The Blob' Dissipates With Help From El Niño

El Niño’s strong winds and a series of winter storms helped cool and break down the 1,000-mile-wide mass of warm sea surface water.

Astronaut Scott Kelly reacts after returning to Earth after nearly one year aboard the International Space Station.

After A Year In Space, Astronaut Scott Kelly To Retire In April

Recently returned from a historic 340-day off-planet mission, Kelly announced Friday he will retire from NASA on April 1, but still continue to participate in research related to his experiment.

Abby McLean of Northglenn, Colo., stands near the stretch of U.S. 85 in Adams County where she was pulled over for a DUI check in September 2014.

The Difficulty Of Enforcing Laws Against Driving While High

Five states will vote on legalizing recreational marijuana in November. For police, it's more challenging to assess if people are driving while high than it is to test for the influence of alcohol.

In 2017, hundreds of thousands of immigrants are expected to be naturalized as U.S. citizens in ceremonies around the country, much like this one in Kansas City, Mo.

Uzbek Family Starts A New Chapter In Its American Journey

To launch our road trip series Our Land, we travel across the country as Donald Trump takes office, and we meet freshly minted citizens at their naturalization ceremony in Kansas City, Mo.

Pilots flying simulator (L to R) Less Abend and Mark Weiss.

NOVA: Why Planes Vanish

Airs Wednesday, July 22, 2015 at 9 p.m. on KPBS TV

Ultra-Orthodox Jews, many of whom live in closed religious communities, on a bus tour of the Israeli offices of Google, Facebook and Microsoft. The tour is sponsored by KamaTech, a group that helps integrate the ultra-Orthodox into Israel's high-tech sector.

As Israel's Ultra-Orthodox Enter The Workforce, High-Tech Beckons

Ultra-Orthodox Jewish men in Israel are increasingly seeking jobs in the secular world, with an eye especially on the high-tech sector.

Love on a Leash volunteers Melissa Cantania and Bonnie Biggs bring their therapy dogs Bosley and Zuni to greet children at the Georgina Cole Library in Carlsbad, on Aug. 17, 2016.

Love On A Leash: Therapy Dogs Spread Love Throughout San Diego

A friendly dog can help you feel better. That's the concept behind Love on a Leash, a nonprofit group that brings therapy dogs to people who need an emotional boost.

Billionaire Environmentalist Targets 7 Statewide Races

Tom Steyer, a California investor, is aiming to label Republican candidates as "science deniers" who are on the wrong side of the climate change issue.

Mother and infant Bouvier's red colobus monkeys in a first-ever photograph of the primate taken in the Democratic Republic of Congo. The species was thought to have gone extinct in the 1970s.

Congo Monkey Spotted Decades After Species' Alleged Demise

Bouvier's red colobus monkey — thought to have disappeared for good from the forests of the Democratic Republic of Congo sometime in the 1970s — has been photographed by two researchers.

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